Steam generator



H. J. SCHNEIDER- STEAM GENERATOR Feb, 4, 19%..

4 Sheets-Sheet 1 Filed April 24, 1933 Ffibu 4, 19364: H J HNE 2,029,838

STEAM GENERATOR Filed April 24, 1935 4 Sheets-She et 2 H. J SCHNEIDER v 2,029,83

STEAM GENERATOR Filed April 24, 1953 4 Sheets-Sheet 3 STEAM GENERATOR Filed April- 24, .1953

4 Sheets-Sheet Patented Feb. 4, 1936 UNITED STATES FATENT OFFICE 7 Claims.

This invention relates to steam generators and more particularly to that type embodying a Yarrow boiler, and it consists in the constructions, arrangements and combinations herein described and claimed.

It is an object of the invention to provide a Yarrow type boiler with a radiant tube installation arranged so as to increase circulation of water through the tubes, thus providing a steam generating unit of high efiiciency from a comparatively small unit.

It is a further object of the invention to provide a steam generating unit in which the steam drum and water tubes have such a relationship to one another as to readily permit the building of the installation in a comparatively small and compact installation and in which practically all heat units are utilized in the production of steam.

Additional objects, advantages and features of invention will be apparent from the following description considered in conjunction with the accompanying drawings, wherein Figure 1 is a front elevation of a boiler embodying my invention,

Figure 2 is a side elevation thereof.

Figure 3 is a section taken on the line 3-'--3 of Figure 1.

Figure 4 is a modification of my device, wherein the boiler tubes are omitted at one side.

Figure 5 is a side elevation thereof.

Figure 6 is a section taken on the line "ii-4i of Figure 4.

Figure '7 is a section taken on the line 1-1 of Figure 6.

Figure 8 is another modification of my invention.

FigureQXis a side elevation thereof.

Figure 10 is a section taken on the line |0-lll of Figure 8.

Figure 11 is a fragmentary side elevation showing a preferred construction of water pipe box.

Referring to the drawings and particularly Figures 1 to 3, there is illustrated a'water and steam boiler l0, including afeed water inlet H. The boiler Ill may be of any suitable capacity and construction, and associated therewith there are water drums I2 and i3. The drums l2 and I3 extend in a plane parallel with the boiler Ill but.

' sit'ioned in respective side walls of the fire-box.

are interconnected by respective banks of water tubes |4--I 5, these tubes extending diagonally inward over the fire box and enter the boiler I 0 upon its underside.

Each bank of water tubes l 4-4 5 provides a multiplicity of innermost tubes [4a and l5w in direct communication with the products of combustion and an outer multiplicity of tubes Nb and I5b. By this arrangement, the tubes Ma and Him, by virtue of direct contact with the products of combustion, will act to conduct heated water to the boiler Ill and the outermost tubes Nb and I5b will act as convection tubes, bringing cooler water from the boiler I U to respective water drums l2l3. Thus a complete and rapid circulation of the water between the boiler Ill and the water drums l2l3 is provided.

In order that advantage may be taken of all possible heat units of a combustion chamber, the

drums l2 and 13 have connected thereto a plurality of water tubes l8ll extended downwardly to occupy a position parallel and within the side walls A of a fire-box, and at a suitable point in the foundation of the generator I provide respective water-boxes l8l9 into which the water tubes are suitably connected. The water boxes l8l9 are also enclosed by the walls A of the fire-box. The water-boxes I 8l9 extend parallel with the water drums l2--l3, as may be clearly seen in Figures 1 and 3, and at suitable points at the forward portions of the boxes they are tapped to receive a plurality of tubes 20--2l. These tubes extend varying distances from their respective boxes toward a point medially of the boiler and are thence abruptly bent and extended rearwardly toward the rear wall of a combustion chamber, where they are secured in a water-boxZZ.

The tubes 20-2! are encased in the base wall B of the fire-box and thus provide a water grate for absorbing heat in the floor portion of acombustion chamber, and in order that heat units at the back portion of the combustion chamber may be utilized I provide a multiplicity of tubes 23 which are connected between the water-box 22 and a rear portion of the boiler iii, as may be seen in Figure 2. These tubes 23 are exposed directly to the heat of combustion.

From the foregoing, it will be apparent that the tubes Ma, Ilia, and 23 will be subjected to direct heat of the products of combustion and consequently will cause water in these tubes to move upwardly toward the boiler, while the tubes Mb, l6 and I! act as convection tubes, thereby creating a complete circulation of water in the installation. In this connection, it may be pointed out, that while the tubes I6 and IT are subjected to certain degree of heat, they are of such length as compared to the tubes I la, lEa, and 23 and the further fact that the tubes l6, I1, and 2| are enclosed in the walls and floor of the fire-box, that the heat transmitted thereto will be substantially less than that to the tubes Ma 23, and consequently the tubes l6!l will tend to feed water intothe boxes IBI3.

In Figure 4, I have illustrated a simplified form of the generator in which certain of the waterboxes have been eliminated and for an understanding of this construction attention is invited to Figures 4, 5, and 6, wherein the boiler is indicated at 24 and the water drums at 25 and 25. The boiler and water drums are arranged as described in conjunction with Figures 1-3 and are connected by a multiplicity of hot water pipes or tubes 21. Only one bank of pipes 21 has been shown in Figure 4, for the sake of clearness, but it will be understood that the Water drum 26, is similarly connected with the boiler 2d. The convection tubes 28 are shown as bowed slightly outward away from the tubes 21 and extend between the boiler and drums as in the first form described.

A single water-box 29 connects the rear wall pipes 36, as in the first form, and also connected to the water box 29 there are two groups of pipes 3l32. Each group of pipes 3l--32 is arranged in superposed relation, and is connected with respective water drums 25-26. The pipes 3 l32 extend forwardly from the water-box 29 a suitable distance and are thence bent outwardly for a short distance and thence upwardly to establish connectionwith the water drums 2526.

In Figures 8, 9 and 10 a further modification is shown, the structure being identical to that described in conjunction with Figures 1-3 with the exception of the connection of the back wall tubes, and therefore like elements are designated by like reference characters.

The boiler l0 and water drums I2 and i3 are connected at their rear ends by respective water pipes 33-34, and intermediate their lengths the pipes 3334 are suitably tapped to receive respective tubes 35, which define the back wall of the combustion chamber. In view of the fact that the pipes 3334 are angularly arranged, the pipes 35 may be bent at their upper ends as at 35 to properly join with the pipes 33-34. The circulation of the water is the same, substantially, as explained in connection with Figure l, but the pipes 3334 increase the passage of the water from the drums l2l3 to the boiler to, as will be readily understood.

Various constructions of water-boxes may be employed, but in Figure 7 I have illustrated a preferred construction. In this construction the box 29 is of square formation, each side of which is suitably apertured for reception of water pipes 3l--32 or similar pipes. By providing apertures on all sides of the box 29 numerous pipe connections may be made, and those apertures which are not required in an installation may be closed by use of a plug 36. The plug 33 comprises a pair of threaded stud members 3'! adapted to snugly seat within the apertures and connected by a bridge portion 38. The plugs 37 are secured in seated engagement with the apertures by nuts 39. The bridge portions 38 will also function to brace the boxes. Also, the water-boxes will include *hand holes ea, permitting access to the boxes,

and these may be closed by clamp plates 4| of ap proved construction.

Another manner of closing the apertures of a water-box or tube is illustrated in Figure 11, wherein the box 42 is shown of circular formation apertured at suitable points for reception of tubes or pipes 42a. Those apertures which are not employed in an installation are closed by a cap member 43 seated within the aperture. Each cap 23 has associated therewith a threaded stem 44 in bearing relation thereto and supported at its outer end by a member 35 held in position by yoke members 46. A nut 48 is engaged upon each threaded stem and located beneath the member 45. Thus, in order to effect a closing of the apertures, it is only necessary to seat the caps 13 with- I in the aperture to be closed and with the stem interposed between the member 45 and the caps, manipulation of the nuts 48 in the proper direction will cause the stems 44 to force the caps downwardly into the apertures. The present construction is particularly well suited for use in connection with the water tubes of the floor and walls of an installation.

I claim:-

1. A boiler comprising a substantially horizontal upper drum, two lower smaller substantially horizontal drums defining the upper lateral boundaries of a fire-box, a multiplicity of water tubes connecting respective lower drums to said upper drum, a multiplicity of water tubes extending downwardly from respective lower drums and defining a foundation for the sides of a firebox, water tubes communicating with the last named tubes arranged in the base of the fire-box, and a multiplicity of water tubes arranged in the back wall of the fire-box and communicating with the tubes in the base of the fire-box and the upper drum.'

2. A boiler comprising a substantially horizontal upper drum, two lower smaller substantially horizontal drums defining the upper lateral boundaries of a fire-box, an inner bank of water tubes connecting respective lower drums to said upper drum, an outer bank of convection tubes connecting respective lower drums to said upper drum, a multiplicity of water tubes extending downwardly from respective lower drums and defining a foundation for the sides of a fire-box, water tubes communicating with the last named tubes arranged in the base of the fire-box, and a multiplicity of water tubes arranged in the back wall of the fire-box and communicating with the tubes in the base of the fire-box and the upper drum.

3. A boiler comprising a substantially horizontal upper drum, two lower smaller substantially horizontal drums defining the upper lateral boundaries of a fire-box, an inner bank of water tubes connecting respective lower drums to said upper drum, an outer bank of convection tubes connecting respective lower drums to said upper drum, a multiplicity of water tubes extending downwardly from respective lower drums and defining a foundation for the sides of a fire-box,

respective water-boxes connected with said" tal upper drum, two lower smaller substantially;

horizontal drums defining the upper lateral boundaries of a fire-box, an inner bank of water tubes connecting respective lower drums to said upper drum, an outer bank of convection tubes connecting respective lower drums to said upper drum, a multiplicity of water tubes extending downwardly from respective lower drums and defining a foundation for the sides of a fire-box, water tubes communicating with the last named tubes arranged in the base of the fire-box, a water-box in communication with said last named tubes, and a multiplicity of tubes in communication with the water-box and the upper drum defining a foundation for the back wall of a firebox.

5. A boiler comprising a substantially horizontal drum, two lower smaller substantially horizontal drums defining the upper lateral boundaries of a fire-box, a multiplicity of water tubes extending downwardly from respective lower drums and defining a foundation for the sides of a fire-box, water tubes communicating with the last named tubes arranged in the base of the fire-box, a multiplicity of water tubes arranged to define a foundation for a back wall of the firebox and communicating with the tubes in the base of the fire-box and the upper drum, an inner bank of water tubes connected between the upper drum and respective smaller horizontal drums, and an outer bank of convection tubes connected between the upper drum and respective horizontal drums.

6. The structure of claim 5 in which the outer bank of convection tubes are bowed outwardly away from the inner bank of water tubes.

'7. A boiler comprising a substantially horizon tal upper drum, two lower smaller substantially horizontal drums defining the upper lateral boundaries of a fire-box, an inner bank of water tubes connecting respective lower drums to said upper drum, an outer bank of convection tubes connecting respective lower drums to said upper drum, a multiplicity of water tubes extending downwardly from respective lower drums and defining a foundation for the sides of a fire-box, water tubes communicating with the last named tubes arranged in the base of the fire-box, a pair of substantially larger water tubes in communication with the upper drum and respectively connected with the horizontal drums, and the tubes in the base of the fire-box having communication with said last named tubes.

HENRY J. SCHNEIDER. 

